Particle Physics

481 talks

S012

Collection TypeSeries

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Displaying 337 - 348 of 481

Soft and Coulomb resummation: squark and gluino production at the LHC
July 09, 2013

PIRSA:13070034
High Energy Physics
From topological insulator to weak scale flavor physics

Sichun Sun University of Washington
April 30, 2013

PIRSA:13040126
High Energy Physics
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute
April 02, 2013

PIRSA:13040115
High Energy Physics
Effective field theory of the unstable top (quark)

Alexander Penin University of Alberta
March 26, 2013

PIRSA:13030090
High Energy Physics
Learning what the Higgs is mixed with

Kunal Kumar Carleton University
March 19, 2013

PIRSA:13030089
High Energy Physics
Renormalization of Entanglement Entropy

Markus Luty University of California, Davis
March 12, 2013

PIRSA:13030108
High Energy Physics
Is the electron round?

Edward Hinds Imperial College London
March 08, 2013

PIRSA:13030100
High Energy Physics
The correlator of two vector and one axial current in QCD

Kirill Melnikov Johns Hopkins University
March 05, 2013

PIRSA:13030099
High Energy Physics
FERMI 130 GeV Line: Dark Interpretations

Matthew McCullough Massachusetts Institute of Technology (MIT)
February 26, 2013

PIRSA:13020150
High Energy Physics
Qanti-kt: Nondeterministic jet clustering

David Krohn Harvard University
February 19, 2013

PIRSA:13020135
High Energy Physics
Indirect Searches for Dark Matter with the Fermi Large Area Telescope

Andrea Marie Albert Ohio State University
January 18, 2013

PIRSA:13010102
High Energy Physics
Boosted Multijet Resonances and New Color-Flow Variables

Brian Shuve Harvey Mudd College
January 15, 2013

PIRSA:13010104
High Energy Physics

Soft and Coulomb resummation: squark and gluino production at the LHC
July 09, 2013

PIRSA:13070034
High Energy Physics
We consider the production of strongly interacting, heavy SUSY pairs at the LHC. When the centre of mass energy is close to the production threshold of the pair, the corresponding cross sections receive large higher-loop QCD corrections. These corrections are classified as the so-called soft logarithms and Coulomb singularities and they lead to a break down of the usual perturbation expansion. In this talk I review the origin of these large corrections and explain how they can be resummed by using Effective Field theories. Finally, I will present some resummed results for the pair production cross sections of heavy squarks and gluinos. Based on: arXiv:1202.2260 and 1211.3408.
From topological insulator to weak scale flavor physics

Sichun Sun University of Washington
April 30, 2013

PIRSA:13040126
High Energy Physics
In this talk, I will start with briefly introducing some universal physics behind quantum hall and topological insulator , which inspired a BSM flavor model. It intimately relates deconstructed little Higgs to flavor structure: fermion masses, CKM etc. This new cousin of little Higgs, we call it little flavor, shares a 10-20 Tev cut-off scale with little Higgs, so as to explain flavor structure at surprisingly low scale without rising FCNC problem.
To Split or Not to Split

Asimina Arvanitaki Perimeter Institute
April 02, 2013

PIRSA:13040115
High Energy Physics
Physics is at a crossroad that leads either to Naturalness or the Multiverse. While the confirmation of gauge coupling unification in the early 90s gave a tremendous boost to naturalness and to low energy SUSY, the lack of evidence for new physics beyond the standard model at the LHC points to a paucity of new particles near the weak scale. This suggests that the weak scale is tuned and that supersymmetry, if present at all, is realized at higher energies. This points to Split SUSY, a framework motivated by the String Landscape. Fine-tuning electroweak symmetry breaking and the renormalization group evolution of the scalar masses constrains Split model building and I review the expectations at the LHC for the different possible Split SUSY particle spectra.
Effective field theory of the unstable top (quark)

Alexander Penin University of Alberta
March 26, 2013

PIRSA:13030090
High Energy Physics
I introduce a new nonrelativistic effective field theory which systematically accounts for the finite lifetime effects in production of unstable particles.
The theory is applied to the threshold production of top quark-antiquark pairs.
Learning what the Higgs is mixed with

Kunal Kumar Carleton University
March 19, 2013

PIRSA:13030089
High Energy Physics
The Standard Model Higgs boson may be mixed with another scalar that does not couple singly to gauge bosons or fermions. The electroweak quantum numbers of such an additional scalar can be determined by measuring the quartic Higgs-Higgs-vector-vector couplings, which contribute—along with the coveted triple Higgs coupling—to double Higgs production in e+e− collisions. We show that simultaneous sensitivity to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling can be obtained using measurements of the double Higgs production cross section at two different e+e− center-of-mass energies. Kinematic distributions of the two Higgs bosons in the final state could provide additional discriminating power.
Renormalization of Entanglement Entropy

Markus Luty University of California, Davis
March 12, 2013

PIRSA:13030108
High Energy Physics
The Standard Model Higgs boson may be mixed with another scalar that does not couple singly to gauge bosons or fermions. The electroweak quantum numbers of such an additional scalar can be determined by measuring the quartic Higgs-Higgs-vector-vector couplings, which contribute—along with the coveted triple Higgs coupling—to double Higgs production in e+e− collisions. We show that simultaneous sensitivity to the quartic Higgs-Higgs-vector-vector coupling and the triple Higgs coupling can be obtained using measurements of the double Higgs production cross section at two different e+e− center-of-mass energies. Kinematic distributions of the two Higgs bosons in the final state could provide additional discriminating power.
Is the electron round?

Edward Hinds Imperial College London
March 08, 2013

PIRSA:13030100
High Energy Physics
We have made a new measurement of the electron’s electric dipole moment (EDM) using a beam of YbF molecules. By measuring atto-eV energy shifts in a molecule, this experiment probes new physics at the tera-eV energy scale. According to the standard model, this EDM is d_e=10^(-38) e.cm – some eleven orders of magnitude below the current experimental limit. However, most extensions to the standard model predict much larger values, potentially accessible to measurement . Hence, the search for the electron EDM is a search for physics beyond the standard model. I will describe our experimental method, our current results and their implications for particle physics. I will also outline the prospects for further major improvement in sensitivity.
The correlator of two vector and one axial current in QCD

Kirill Melnikov Johns Hopkins University
March 05, 2013

PIRSA:13030099
High Energy Physics
It is known that the correlator of one axial and two vector currents, that receives leading contributions through one-loop fermion triangle diagrams, is not modified by QCD radiative corrections at two loops. It was suggested that this non-renormalization of the VVA correlator persists in higher orders in perturbative QCD as well. To check this assertion, I compute the three-loop QCD corrections to the VAA-correlator using the technique of asymptotic expansions. I find that these corrections do not vanish and that they are proportional to the QCD beta-function. I will also review some properties of the VVA correlator that were discovered in recent years.
FERMI 130 GeV Line: Dark Interpretations

Matthew McCullough Massachusetts Institute of Technology (MIT)
February 26, 2013

PIRSA:13020150
High Energy Physics
Last year strong evidence was claimed for a 130 GeV gamma ray line from the galactic center in the FERMI telescope data. In the first half of the talk I will review the status of the evidence, including recent suggestions which call it into question. In the second half of the talk, under the bold assumption that the line is a genuine signature of dark matter, I will review some of the properties required of dark matter to explain the line and the general features of models proposed to explain it. This second half will include material from recent work with Francesco D'Eramo and Jesse Thaler (arxiv:1210.7817), which suggests that the line is readily explained by dark matter "semi-annihilation" rather than the standard annihilation interpretation.
Qanti-kt: Nondeterministic jet clustering

David Krohn Harvard University
February 19, 2013

PIRSA:13020135
High Energy Physics
The interpretation of events with jets is often ambiguous, especially for the sort of highly complex events one encounters at the LHC. One often finds that an event interpreted as signal-like using one choice of jet algorithm and radius parameter is no longer signal-like with another, even if the two are very similar. Here we present an extension of the Qjets procedure designed to account for this ambiguity and assign each plausible interpretation of an event a weight, so that events which are unambiguously signal-like carry more influence on one's results than events which are only marginally so. This procedure can be used with any existing analysis employing a sequential recombination algorithm like anti-kT and we will show that through its use the statistical power of an analysis often increases. In particular, we will see that a up to a 20\% improvement in statistical significance can be realized for a Higgs-like analysis searching for a resonance recoiling against an associated vector boson.
Indirect Searches for Dark Matter with the Fermi Large Area Telescope

Andrea Marie Albert Ohio State University
January 18, 2013

PIRSA:13010102
High Energy Physics
There is overwhelming evidence that non-baryonic dark matter constitutes ~23% of the energy density of the universe. Weakly Interacting Massive Particles (WIMPs) are promising dark matter candidates that may produce gamma rays via annihilation or decay detectable by the Fermi Large Area Telescope (Fermi LAT). A detection of WIMPs would also indicate the existence of physics beyond the Standard Model. I will present recent results from indirect WIMP searches by the Fermi LAT Collaboration. I will focus on our recent search for gamma-ray spectral lines from WIMP annihilations with 4 years of data. There has been recent excitement with the report of a line-like feature localized in the galactic center around 130 GeV. I will be discussing what our search finds and the systematic checks we've performed on potential signals.
Boosted Multijet Resonances and New Color-Flow Variables

Brian Shuve Harvey Mudd College
January 15, 2013

PIRSA:13010104
High Energy Physics

Title	Speaker(s)	Date	Talk Type	Info
Soft and Coulomb resummation: squark and gluino production at the LHC		2013-07-09	Scientific Series	View details
From topological insulator to weak scale flavor physics	Sichun Sun	2013-04-30	Scientific Series	View details
To Split or Not to Split	Asimina Arvanitaki	2013-04-02	Scientific Series	View details
Effective field theory of the unstable top (quark)	Alexander Penin	2013-03-26	Scientific Series	View details
Learning what the Higgs is mixed with	Kunal Kumar	2013-03-19	Scientific Series	View details
Renormalization of Entanglement Entropy	Markus Luty	2013-03-12	Scientific Series	View details
Is the electron round?	Edward Hinds	2013-03-08	Scientific Series	View details
The correlator of two vector and one axial current in QCD	Kirill Melnikov	2013-03-05	Scientific Series	View details
FERMI 130 GeV Line: Dark Interpretations	Matthew McCullough	2013-02-26	Scientific Series	View details
Qanti-kt: Nondeterministic jet clustering	David Krohn	2013-02-19	Scientific Series	View details
Indirect Searches for Dark Matter with the Fermi Large Area Telescope	Andrea Marie Albert	2013-01-18	Scientific Series	View details
Boosted Multijet Resonances and New Color-Flow Variables	Brian Shuve	2013-01-15	Scientific Series	View details

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Format results

Soft and Coulomb resummation: squark and gluino production at the LHC

From topological insulator to weak scale flavor physics

To Split or Not to Split

Effective field theory of the unstable top (quark)

Learning what the Higgs is mixed with

Renormalization of Entanglement Entropy

Is the electron round?

The correlator of two vector and one axial current in QCD

FERMI 130 GeV Line: Dark Interpretations

Qanti-kt: Nondeterministic jet clustering

Indirect Searches for Dark Matter with the Fermi Large Area Telescope

Boosted Multijet Resonances and New Color-Flow Variables

Soft and Coulomb resummation: squark and gluino production at the LHC

From topological insulator to weak scale flavor physics

To Split or Not to Split

Effective field theory of the unstable top (quark)

Learning what the Higgs is mixed with

Renormalization of Entanglement Entropy

Is the electron round?

The correlator of two vector and one axial current in QCD

FERMI 130 GeV Line: Dark Interpretations

Qanti-kt: Nondeterministic jet clustering

Indirect Searches for Dark Matter with the Fermi Large Area Telescope

Boosted Multijet Resonances and New Color-Flow Variables